Question

I have a class that extends PDO to give it the ability to pull the configuration from an xml file. Unfortunately the our hosting provider has disabled SimpleXML so I need to refactor my code to use Dom, which is available.

I am using the following code:

class xmlPDO extends PDO
{
    public function __construct($xml_uri){
        $xml = simplexml_load_file($xml_uri);
        $dsn_template = "%s:host=%s; dbname=%s";
        $dsn = sprintf($dsn_template, $xml->dsn->driver, $xml->dsn->host, $xml->dsn->dbname);
        parent::__construct($dsn, $xml->username, $xml->password);
    }
}

To read the following XML:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE database [
<!ELEMENT database (name, description, dsn, username, password)>
    <!ELEMENT name (#PCDATA)>
    <!ELEMENT description (#PCDATA)>
    <!ELEMENT dsn (driver, dbname, host)>
        <!ELEMENT driver (#PCDATA)>
        <!ELEMENT dbname (#PCDATA)>
        <!ELEMENT host (#PCDATA)>
    <!ELEMENT username (#PCDATA)>
    <!ELEMENT password (#PCDATA)>
]>

<database>
    <name>Test Database</name>
    <description>Localhost test database, use only for testing</description>
    <dsn>
        <driver>mysql</driver>
        <dbname>test</dbname>
        <host>localhost</host>
    </dsn>
    <username>user</username>
    <password>test</password>
</database>

I am looking at the php.net documentation and am having a really hard time trying to figure out how I am supposed to be doing this. I can’t seem to be any clear code examples of pulling out data like this.

Answer 1

Or I could use the simple xml for php 4 class that behaves pretty much as simple xml, but works when simple-xml is disabled.